Its a really harsh thing to contemplate even hypothetically.
I cant say with certainty what I would decide b/c it's difficult to imagine making such a decision, but I think another critical thing I would have to consider would be this: if exhuming her body convinced LE of my innocence then it might be worth it. Not b/c I was concerned about exonerating myself, but b/c then LE would move past me as a possible suspect, and finding her killer would be my main concern.
This of course is all based on the idea that I was innocent in the first place